Tb–Cu grain boundary diffusion effects on single- and multi-main-phase Nd–Fe–B based magnets

Abstract

Although Tb diffusion is deeper in multi-main-phase (MMP) magnets than in single-main-phase (SMP) magnets, the coercivity enhancement and squareness of diffused MMP magnets are lower than those of SMP magnets due to the larger gradient of anisotropy.